Rotate the axes so that the new equation contains no xy-term. Graph the new equation.31x2 + 10
xy + 21y2 -144 = 0
A. 
B. 
Answer: A
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Write the sum or difference as a product containing only sines and/or cosines.sin(6?) - sin(2?)
A. 2 cos(2?) cos(4?) B. 2 sin(2?) cos(4?) C. 2 sin(2?) D. 2 sin(4?) cos(2?)
Find the probability.If two cards are drawn without replacement from a deck, find the probability that the second card is red, given that the first card was a heart.
A. 
B. 
C. 
D. 
For the equation, determine the constants A and B that make the equation an identity.
= 
+ 
A. A = 
, B = 
B. A = 1, B = 
C. A = 
, B = 1
D. A = - 
, B = 
Solve the problem.Yearly sales at a certain department store follow the model 
where y is the total sales in thousands of dollars and x is the number of years after the store opened. How many years after the store's opening will the total sales for the year first be less than 
?
A. 11 yr B. 13 yr C. 465 yr D. 3 yr